package com.sp.app.util;

import java.security.MessageDigest;

/**
 * @Description:MD5工具�?
 * @author: Caox
 * @createTime: 2017�?12�?12�? 下午2:38:12 
 */
public class MD5Util {

	/**
	 * @Description:MD5加密 
	 * @author: Caox
	 * @createTime: 2017�?12�?12�? 下午2:37:52 
	 * @return String  返回类型
	 * @param inStr
	 * @return
	 */
	public static String string2MD5(String inStr) {
		MessageDigest md5 = null;
		try {
			md5 = MessageDigest.getInstance("MD5");
		} catch (Exception e) {
			e.printStackTrace();
			return "";
		}
		char[] charArray = inStr.toCharArray();
		byte[] byteArray = new byte[charArray.length];

		for (int i = 0; i < charArray.length; i++)
			byteArray[i] = (byte) charArray[i];
		byte[] md5Bytes = md5.digest(byteArray);
		StringBuffer hexValue = new StringBuffer();
		for (int i = 0; i < md5Bytes.length; i++) {
			int val = ((int) md5Bytes[i]) & 0xff;
			if (val < 16)
				hexValue.append("0");
			hexValue.append(Integer.toHexString(val));
		}
		return hexValue.toString();

	}
	
	 public static String convertMD5(String inStr){  
		  
	        char[] a = inStr.toCharArray();  
	        for (int i = 0; i < a.length; i++){  
	            a[i] = (char) (a[i] ^ 't');  
	        }  
	        String s = new String(a);  
	        return s;  
	  
	    }  
	  
	    // 测试主函�?  
	    public static void main(String args[]) {  
	        String s = new String("tangfuqiang");  
	        System.out.println("原始�?" + s);  
	        System.out.println("MD5后：" + string2MD5(s));  
	        System.out.println("加密的：" + convertMD5(s));  
	        System.out.println("解密的：" + convertMD5(convertMD5(s)));  
	  
	    }  
	
}
